Orange Sponge Tube Cake - cooking recipe

Ingredients

6 egg yolks
1 tablespoon orange zest
1/2 cup orange juice
1 cup sugar
1/4 teaspoon salt
1 1/3 cups flour
6 egg whites
1 teaspoon cream of tartar
1/2 cup sugar

Preparation

Pre-heat the oven to 325\u00b0.
Beat the egg yolks until very thick and light-colored.
Add the orange peel and the juice and continue to beat until very thick.
Beat in 1 cup of sugar and the salt.
Gently fold in the flour.
In a separate bowl, beat the egg whites and cream of tartar until they reach the soft-peak stage.
Gradually add the remaining 1/2 cup of sugar.
Gently fold the egg whites into the egg yolk mixture.
Spoon into ungreased 10-inch tube pan.
Bake 55 minutes, or till done.
Invert pan to cool.